June 18


Secrets of the Sleeping Brain

By Susan Grotenhuis

June 18, 2015

Alzheimer's, sleep

By Susan Grotenhuis

Humans have been pushing the natural boundaries between day and night for centuries. In the 1800s, we used candles and gas lamps to extend the day. Today in America, you can go for a meal, exercise at the gym, or shop for groceries at almost any time during a 24-hour cycle. There are plenty of opportunities to stay awake. Most of us are experts, on the go for 16 to 20 hours a stretch, and if the mornings are a little challenging, there’s always the corner coffee shop (open nice and early) to get us revved up.

Making sleep a priority, however, is another matter. If you had to use one word to honestly describe your sleeping habits, what would it be? Erratic? Perhaps inadequate? A majority of Americans report sleeping poorly and many more convince themselves they don’t need much sleep. But they’d be wrong. When sleep experts say we need seven to nine hours’ of sleep, they know what they’re talking about.

In the last couple of decades big strides have been made in sleep research. Scientists have learned that we use sleep to regenerate our cells, practice skills and consolidate memories. They also found that energy consumption within the brain didn’t fluctuate much between wakefulness and sleep, which didn’t make sense. Many neural functions shut down at night and… well, take a rest. The question left unanswered was, why didn’t energy consumption decrease during sleep?

A team of researchers at the University of Rochester Medical Center’s Center for Translational Neuromedicine, led by co-director Maken Nedergaard, think they have the answers. Through advanced brain-imaging technology, they observed the sleeping brains of mice, which are strikingly similar to humans’. They discovered what they call the glymphatic system, which cleans the brain and rids it of harmful toxins. It works like a trash removal company, rumbling around the neighborhood, picking up trash and dumping it in a landfill (which turns out to be the liver). It pumps cerebrospinal fluid (CSF) throughout the brain, whose cells, during this process, contract and shrink by up to 60%! This contraction allows the CSF to flow more freely, consequently doing a more thorough job. The team found that the glymphatic system is close to ten times more active during sleep than it is during wakefulness and was the cause of all that energy usage. Working with limited resources, the brain chooses to perform this vital purge during sleep rather than when we’re awake, doing all our “stuff.”

The big headline from this research is that the toxins being cleared from our brain include amyloid-beta, thought to be responsible for Alzheimer’s disease. If we don’t get enough sleep, these and other neurotoxins accumulate where they can cause serious, long-term damage. And if you need more motivation to reform your sleep habits, people with sleep deficits are more likely to be depressed, be obese, develop diabetes, have a weaker immune system, and age prematurely.

How, then, do we romance our bodies away from our artificially stimulated lifestyles back to a more natural day/night cycle? Here are some handy tips.

1. Ditch the technology two hours before bedtime. Tablets, TVs and smartphones all emit blue light, which occurs naturally in the morning. We confuse our circadian rhythm when we stimulate our minds with blue, morning light just before bed. (Gamers take note – play in the morning instead.)

2. Embrace the morning! Open the blinds and step outside. Getting lots of early light will stimulate the production of the sleep hormone melatonin. Studies show that people who get two hours of morning light sleep better.

3. Drink your coffee – but have it early. No caffeinated beverages within seven hours of bedtime.

4. Romance the night. Dim the lights, put on some soft music and put your body in the mood for sleep.

5. Set a schedule and stick to it. Get up and go to bed at roughly the same time every day. You may need to start slowly and gradually adjust your schedule to reach the desired seven hours’ minimum.

Make sleep a priority and protect your cognitive as well as physical health!

Here is the link to a sleep diary published by the National Sleep Foundation:


About the author

Susan Grotenhuis is a Wellness Professional and certified Brain Fitness Facilitator at Asbury Methodist Village, a Gaithersburg, Md.-based continuing care retirement community. Susan’s passion for health and fitness drew her to a second career in the fitness industry and she has been assisting Asbury residents reach their wellness goals for three years. In addition to holding certifications in personal training and senior fitness, Susan developed and teaches an 8-week course on brain fitness and health for residents at the community. Brain Waves helped Asbury Methodist Village earn a 2014 Innovator of the Year award from the International Council on Active Aging.

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